Performance evaluation of optically pre-amplified 16-ary PPM systems with Fabry-Pe´rot filters

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In this study, we evaluate the end-to-end performance of an optically pre-amplified 16-ary pulse position modulation (PPM) system for the use in free-space optical communication. Simulations were carried out to evaluate the bit-error-ratio (BER) for several scenarios. The results show that the optimum full width half maximum (FWHM) for the Fabry-Pérot filter is twice the bit rate. For the optimum FWHM of the Fabry-Pérot filter with 20 dB extinction ratio, a BER of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> is achieved at E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">b</sub> /N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> of 9.5 dB where E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">b</sub> is the energy per bit and N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> is the effective single-sided power spectral density of the noise at the amplifier input. The results also show up to 9.7 dB improvement when compared to the case of on-off keying (OOK) with extinction ratio of 20 dB and an optimum Fabry-Pérot filter with FWHM equal to 0.7 of the bit rate for the same BER of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> .